Well if its a guppy. Its gonna need some friends when its older. good rule is 1 male. Needs 2-3 females.

Thats the rule of thumb, if its a platy, molly, guppy or any live bearer.

However swordtails are the only species that are happy to break that rule. They can be paired off. The male doesn't show much aggression and doesn't chase the female as much as other livebearers do. If you don't want other babies and it turns out be be a sword, then you can get another female sword they will have a blast together.

( currently own a pair of swords, and a breeder of platies, thinking of breeding mollies and betta's down the road)

what temperature should the water be? when will it need to move to a bigger tank? I have an air pump hooked up to an air stone now in the tea pot. When should I move it to the 3.5? Does it need a filter? How often do I feed it? Its sooo tiny you have to look hard to see it. Its really fast!

I moved him to the 3.5 gallon with airstone a fake grass plant and live anubias and moneywort floating. I figured he might feel better with few places to hide and the plants might help a little with the water. What should water changes look like? 50% every day? and how do I know if he is eating? Can anyone please help?

I'd do about 25% water changes maybe twice a week, (add Prime of course) and keep the temp between 78-80. Feed 2-3 times a day with frozen baby brine shrimp and/or crushed veggie flakes of a good brand. Crush it into a fine powder. Rotate the brine shrimp and flake ie; brine shrimp in the morning and flakes at night. If you feed him and stand back a bit, you'll probably see him darting here and there, catching the food. Hopefully he will eat well for you. If I'm wrong on any of this, someone please chime in! I'm fairly new to this myself.

all i have is the nls so he is getting that crushed. I think he is eating, he seems healthy. he never stops swimming! He like chasing the bubbles lol. How long before he needs a bigger tank than 3.5 g? Here are some better pics.